PURPOSE: To enable a long-life high-temperature secondary battery to be provided by separating a molten metal and an electrolyte, which is positioned on the molten metal, owing to the difference between their specific gravities, and preparing an electrode touching a gaseous active material from a porous material so that the electrolyte, the gaseous active material and the electrode are maintained to be in contact with each other even when there is any change in the liquid level of the electrolyte.
CONSTITUTION: The symbol 6 represents a positive electrode which is made in contact with an electrolyte 5, made of a porous conductive body which shows a corrosion resistance to a positive active material, and electrically connected to an upper case 2 made of a conductive material. The symbol 7 represents a gaseous-positive-active-material chamber which is provided between the positive electrode 6 and the upper case 2. The symbols 8 and 9, respectively, represent the gas inlet and the gas outlet of the chamber 7. As the electrolyte 5, a molten salt principally consisting of a product of the reaction of the battery is employed. The electrolyte 5 and a molten metal 4 which is used as a negative active material are separated owing to the difference between their specific gravities. The positive electrode 6 is made of a porous material, and has a thickness larger than the variation of the thickness of the molten-salt electrolyte 5 which is caused during charge and discharge, so that the electrolyte 5, the positive active material and the positive electrode 6 are maintained to be in contact with each other even when change of the liquid level of the electrolyte 5 is caused.
FUJITA KAZUNORI
TAMURA KOUKI
MATSUDA SHINPEI
